▎ 摘　　要

NOVELTY - Use of composite wave-absorbing material on variable frequency motor of electric vehicle, is claimed. The material is iron-silicon-chromium alloy/graphene oxide/yttrium, and is prepared by using metal soft magnetic material iron-silicon-chromium alloy as a base, doping graphene oxide and coupling agent-calcium stearate, compounding, and treating with sodium chloride salt solution for corrosion modification. The preparation method of the material involves adding iron-silicon-chromium raw material to a vacuum furnace, preheating at low temperature, adding iron-silicon-chromium alloy, graphene oxide, calcium stearate and ball-milling bearing steel balls to a ball-milling tank, adding absolute ethanol to the ball mill tank, stirring and evenly mixing, sealing, storing and adding to a vibration ball mill for ball milling to obtain slurry, vacuum drying to obtain composite wave-absorbing material, placing in a sodium chloride solution for corrosion treatment, and post-treating. USE - Use of composite wave-absorbing material on variable frequency motor of electric vehicle. ADVANTAGE - The composite wave-absorbing material has excellent electromagnetic compatibility effect, and corrosion resistance. DETAILED DESCRIPTION - Use of composite wave-absorbing material on variable frequency motor of electric vehicle, is claimed. The composite wave-absorbing material is iron-silicon-chromium alloy/graphene oxide/yttrium, and is prepared by using metal soft magnetic material iron-silicon-chromium alloy as a base, doping graphene oxide and coupling agent-calcium stearate, compounding, and treating with sodium chloride salt solution for corrosion modification. The material has a thickness of 2.2 mm. The frequency band when the reflection loss of the material is less than -10 dB is between 1.7 GHz and 2.8 GHz. The doping amount of graphene oxide and calcium stearate in the material is 0-1.5% of the mass of iron-silicon-chromium alloy. The preparation method of the wave-absorbing material involves adding iron-silicon-chromium raw material to a vacuum furnace, preheating at low temperature, adding iron-silicon-chromium alloy, graphene oxide, calcium stearate and ball-milling bearing steel balls to a ball-milling tank, adding absolute ethanol to the ball-milling tank, stirring and evenly mixing, sealing, storing and adding to a vibration ball mill for ball milling to obtain a slurry, vacuum drying to obtain composite wave-absorbing material, placing in a sodium chloride solution for corrosion treatment and post-treating the corroded sample to obtain composite wave-absorbing material with modified surface corrosion.